AEE Energy Management CEM

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AEE Certified Energy Manager (CEM) Sample Questions:

1. In a chilled water thermal energy storage system, chilled water is stored at 4°C and used for supply water.
Chilled water return is 14°C. Calculate the storage capacity required to hold 50 GJ of thermal cooling. (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 1,191 m³
B) 2,618 m³
C) 4,180 m³
D) 766 m³
E) 1,356 m³

2. An air conditioning unit cools make-up air from 25°C (dry bulb temperature) and 50% relative humidity down to 13°C. What type of heat has been removed from the air?

A) Latent heat
B) Both sensible and latent heat
C) Sensible heat
D) No heat energy has been removed

3. What instrument is NOT used to measure temperature?

A) Hot-wire anemometer
B) Optical pyrometer
C) Thermistor
D) Bimetallic thermometer
E) Thermometer

4. A fully-loaded heat pump unit delivers 36-kW thermal heating with a power draw of 12-kW electric. What is the coefficient of performance (COP) at full load?

A) 4.0
B) 3.0
C) 5.0
D) 2.0
E) 6.0

5. Using the natural gas combustion efficiency tables in your workbook, find the combustion efficiency (based on higher-heating value) of a natural-gas-fired boiler if the excess air level is measured at 31.9% and the stack temperature rise is 187.8°C.

A) 76%
B) 78%
C) 84%
D) 82%
E) 80%

Solutions: